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Rubber compositions

a technology of compositions and rubber, applied in the field of rubber compositions, can solve the problems of not increasing the strength and stiffness of rubber compounds obtained with their aid, and achieve the effects of increasing the strength and stiffness of rubber compounds, reducing the processing viscosity of rubber compounds, and high molar mass

Active Publication Date: 2015-04-30
ALLNEX GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about using a special type of chemical called reactive diluents to improve the process of making rubber compounds. These chemicals help reduce the viscosity of the rubber mixture during the compounding process, which saves energy and reduces the amount of chemicals needed. However, these chemicals should not affect the strength or stiffness of the rubber compound after it has been vulcanised. The patent describes several types of reactive diluents that can be used, such as epoxides, aziridines, N-alkoxyamides, isocyanates, carbodiimides, and activated olefinically unsaturated groups. These chemicals react with the rubber material during vulcanisation to further reduce viscosity. Additionally, the patent mentions the use of adducts made from carbamates and aldehydes, which also help reduce viscosity. Overall, the patent provides a technical solution for improving the rubber compounding process while saving energy and maintaining strength and stiffness.

Problems solved by technology

These plasticisers do, however, not increase the strength and stiffness of rubber compounds obtained with their aid beyond the values obtained with a non-plasticised rubber compound.

Method used

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Examples

Experimental program
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example 1

[0033]A resin based on n-hexylcarbamate and formaldehyde was made according to the following procedure:

example 1.1

n-Hexyl Carbamate

[0034]14.45 kg of n-hexanol were charged into a reaction vessel equipped with a stirrer, a thermometer, a nitrogen inlet, and a dropping funnel. 1.2 g of a commercial dibutyltin oxide (Fascat 4100, Elf-Atochem) and 6.0 kg of urea were added, and the resulting mixture was heated to reflux (160° C.). The reaction was continued for five hours, and reflux was maintained by reducing the pressure. The mass fraction of residual urea in the reaction mixture had fallen to 1.0%. After separation of the excess hexanol by distillation under reduced pressure, a clear melt of n-hexyl carbamate (CAS-No. 2114-20-7) was obtained which solidified at 55° C.

example 1.2

Adduct Resin of n-Hexyl Carbamate and Formaldehyde

[0035]The carbamate of n-hexanol made in Example 1.1 was melted to 95° C. in a reaction vessel, and 11 kg of an aqueous solution of formaldehyde having a mass fraction of formaldehyde of 37% was added over thirty minutes under stirring, and cooling to 60° C. When this temperature was reached, 90 g of an acid ion exchange resin (®Amberlyst 15 dry, sulphonic acid-functional reticulated resin based on styrene-divinylbenzene copolymers, The DOW Chemical Co.) were added, and the vessel was deaerated by evacuation-nitrogen purge cycles. The contents of the vessel were then heated up to 95° C., taking advantage of the exothermic reaction, held at that temperature for one hour, whereupon the temperature was slowly increased up to 135° C. to distil off the remaining water. The viscosity of the remaining pale yellow resin was 8.9 Pa·s, measured at 70° C. at a shear rate if 25 s−1. A mass fraction of 0.08% of remaining formaldehyde was determin...

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Abstract

The invention relates to a rubber composition comprising a rubber and a processing additive wherein the processing additive is a functional reactive diluent having at least one functional group in the molecule which is not an olefinic unsaturation, to a process of compounding such rubber compositions, and to the use thereof.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to rubber compositions comprising a rubber compound and a processing additive, to a method of preparation thereof, and to a method of use of such rubber compositions in mechanical rubber goods, particularly in tyres.[0002]Many various chemicals, usually referred to as “Rubber Chemicals and Additives”, are used in manufacturing of rubber-elastic materials. They serve to simplify and facilitate the compounding process, to control the elastomer properties of the compounded rubber material, and to protect the material during compounding, and thereafter as finished product, from deterioration. Among these are vulcanisation chemicals which support crosslinking of the rubber, particularly sulphur, sulphur donors, and peroxides, activators such as zinc oxide, and accelerators such as sulphenamides, thiazoles, thiurams, and dithiocarbamates. Hardness of the rubber compound can be influenced by fillers, among which carbon black and the so...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08J3/20
CPCC08L7/00C08J3/203C08J2461/22C08J2307/00C08L2205/03B60C1/00C08K5/205C08L21/00C08K5/09B60C2001/0058
Inventor SCHAFER, RALPH
Owner ALLNEX GERMANY
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